CN1774349A - Pneumatic tire and method of mounting the same - Google Patents
Pneumatic tire and method of mounting the same Download PDFInfo
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- CN1774349A CN1774349A CN 200480010002 CN200480010002A CN1774349A CN 1774349 A CN1774349 A CN 1774349A CN 200480010002 CN200480010002 CN 200480010002 CN 200480010002 A CN200480010002 A CN 200480010002A CN 1774349 A CN1774349 A CN 1774349A
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Abstract
Run-flat tires capable of effectively improving run-flat durability without sacrificing riding comfortableness in normal running under normal inner pressure, the run-flat tire of a first invention wherein a belt (8) formed of at least one sheet of cord rubber coated layer is installed between the crown part of a carcass (7) formed of at least one ply extending in toroidal shape to bead parts (3), side wall parts (4), and a tread part (5) and the tread part (5), reinforcement rubbers (11) of generally crescent shape in cross section are installed at least on the inner surface sides of the side wall parts (4), and ring-shaped rim guard parts (13) projected toward the lateral outside of the tire are installed on the outer surfaces of the tire just above rim flanges (Rf), characterized in that the rim guard parts (13) are formed of hard rubber, and the 100% modulus of the hard rubber is 3.0 MPa or higher and within two to five times the 100% modulus of skin rubber (14) forming the side wall parts (4).
Description
Technical field
The present invention relates to run-flat tire because low tire pressure or puncture and effective improvement of Runflat durability during travelling continuously under the condition of losing heart, and can not sacrifice for example ride comfort during carrying out cruising of other characteristic with normal air pressure.
Background technology
When tire by low tire pressure or when puncturing under the disappointing condition that causes long-term use, the deflection of tire sidewall part and becoming, so often appearance ahead of time of damaged tyres greater than deflection under the conventional design pressure condition and distortion.Observe general tire failure state, the large deformation of discovery sidewall part causes the contact repeatedly between the each several part on the tire inner surface easily, thereby cause Tyte Wear and fracture, perhaps it makes tire separate with wheel rim easily, and the big distortion of collapsing appears in bead part.
In order to solve this damage problem, known run-flat tire is a kind ofly to have the sidewall part that rigidity strengthens or have the tyre bead of special manufacturing and the tire of wheel rim.
From further inspection, find the damaged condition of run-flat tire, even the deflection of tire sidewall part and distortion are enhanced preventing in its rigidity and also become greater than deflection under the conventional design pressure condition and distortion in the tire that contacts in the tire, and stress concentration is on the maximum width position that becomes the tire that damages core or near it.
Proposed to be used to suppress to damage the method that core occurs, wherein rubber layer has been stacked between the multilayer casingply or the Reinforced Rubber that will have a given shape is arranged on the inside face of carcass (for example referring to JP 2000-168319A, JP 2000-52724A and JP2000-190715A).But all these methods all can cause weight to increase or production efficiency reduces.In addition, the rigidity in the radial direction during carrying out cruising under the normal air pressure condition along tire, promptly so-called longitudinal spring stiffness coefficient increases, thereby ride comfort is descended.Therefore, be difficult to improve effectively the Runflat durability.
Simultaneously, at the so-called traffic way of vehicle ' be exclusively used on the border between pedestrian's the so-called footway and be typically provided with markings or the step that is used to distinguish the boundary line.For the situation of back, so-called curb often is set.
When vehicle passed in and out the house or is parked in it on the roadside via traffic way, its tire may impinge upon on the curb.In this case, crooked very big sidewall part is clipped between curb and the wheel rim, thereby produces fracture, and this causes poking in the poorest situation.In addition, the wheel rim of low-profile tire easily with the curb direct contact, thereby the outside face of wheel rim is damaged easily, and so can deface greatly or wheel rim can break.
Impaired in order to prevent tire from contacting with its wheel rim because with obstacle (for example curb); on the part of the sidewall of tire, especially be provided with wheel rim protection part between the maximum width position of tire and bead part, it also is called the wheel rim guard member for short in many cases.
The outside face that the setting of wheel rim protection part is mainly used to prevent tire perhaps is used for improving its aesthetic property (for example outward appearance of tire) when tire uses and above-mentioned curb direct contact under normal air pressure.
The present invention is devoted to as improving the above-mentioned wheel rim protection part of Runflat durability means in the increase minimum that is used for especially making during conventional the travelling the longitudinal spring stiffness coefficient under normal air pressure, and finds that optimizing the wheel rim guard member is useful for this purpose.
In for example JP 11-157311A, JP 53-138106A and JP 2002-59713A, disclosed to have and be used for forming fracture on the outside face of sidewall part or preventing the conventional tire of the wheel rim protection part of the purpose of wheel rim impaired except preventing.
Relate to the raising of the ride characteristic in the Runflat state and the improvement of bead part durability at the tire disclosed in the JP 11-157311A.In this tire, the wheel rim skid resistant course that will be made of soft relatively rubber is located at the position respect to one another, top of the wheel rim of wheel rim protection part, and the remainder of wheel rim protection part is made of solid rubber.But, protect the rubber of part not have and constitute the relevant regulation of exocuticle rubber of sidewall part to the wheel rim that constitutes this tire.Though this structure has some effects for improving the Runflat durability, it can not provide enough Runflat durabilitys in worse disappointing condition (for example comprising under the situation of flank force).
Be intended to tolerance load (withstand load) and the durability that maintenance is enough during disappointing travelling at the tire disclosed in the JP 53-138106A, and for example this accident of wheel rim slippage can not occur.In this tire, be shaped as circular high rigidity reinforcement (pseudo-tyre bead) and be embedded in the wheel rim protection part.But the setting of this puppet tyre bead is not the deflection that is used for suppressing the sidewall part.In addition, this tire has such problem, and the rubber part that wherein is clipped in the bead part between wheel rim and the pseudo-tyre bead during disappointing travelling is out of shape easily repeatedly and to a great extent, thereby becomes the core of damage.And the longitudinal spring stiffness coefficient of depressing in common increases, and therefore can reduce ride comfort.
Be intended to improve the anti-cutting (cutting resistance) on low oil consumption and sidewall at the tire disclosed in the JP2002-59713A, and ride comfort can not reduce.The wheel rim guard member of this tire is made of the rubber that wherein is dispersed with the chopped fiber of being made by organic fiber.But this tire is by applying the air-inflation tyre that normal air pressure uses, rather than improves the air-inflation tyre of Runflat durability by wheel rim protection part is set.
In view of above-mentioned aspect; the technical scheme that does not also have a kind of like this run-flat tire up to now; promptly; it can lose heart increase effectively during travelling the longitudinal spring stiffness coefficient and thereby obviously improve the Runflat durability, make the increase of longitudinal spring stiffness coefficient during carrying out normal driving under the normal air pressure keep minimum by optimizing wheel rim protection part simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of like this run-flat tire; promptly; thereby it is by optimizing wheel rim protection part because low tire pressure or expose and have the Runflat durability of effective improvement during travelling continuously under the condition of losing heart; simultaneously can not sacrifice other characteristic; especially for example carry out the ride comfort during conventional the driving under normal air pressure, described wheel rim protection part is also referred to as the wheel rim guard member and is set at and is used for preventing that tire and its wheel rim are impaired owing to contacting with obstacle (for example curb) on the outside face of sidewall part of tire.
To achieve these goals, a first aspect of the present invention is a kind of run-flat tire, it comprises: a bracing ply, it is made of the cordline that the one deck at least between crown that is laid on carcass and the tread portion is coated with rubber, and described carcass is by the pair of sidewall part that embeds the carcass plies of one deck at least that extends ringwise on the pair of bead portions that bead core is arranged therein, extends radially outward from bead part and cross the tread portion that the sidewall part extends and constitute; One Reinforced Rubber, it has and is substantially the crescent section shape and is arranged in the inner surface side place of sidewall part at least; An and annular rim protection part; this part is protruding and therein tire is applied to the outer surface position place that is arranged in the tire that and then is positioned at the wheel rim top in the state on the standard rim along tire width direction; this tire is characterized in that; wheel rim protection part is formed by solid rubber; and 100% modulus of this solid rubber is not less than 3.0MPa, and in two to five times scope of the modulus of the exocuticle rubber that constitutes the sidewall part.
A second aspect of the present invention has the basic structure identical with first aspect, and it is characterized in that, is disposed in position near at least a portion circumferential surface of wheel rim protection part by comprising the compound enhancement layer of one deck at least that the rubber that strengthens element constitutes.
A third aspect of the present invention has the basic structure identical with first aspect; and it is characterized in that; at least a portion wheel rim protection part is formed by solid rubber; 100% modulus of this solid rubber is not less than 3.0MPa; and in two to five times scope of the modulus of the exocuticle rubber that constitutes the sidewall part, and be disposed in the wheel rim protection part or be disposed in position near wheel rim protection at least a portion circumferential surface partly by comprising the compound enhancement layer of one deck at least that the rubber that strengthens element constitutes.
The outer rubber part that the wheel rim of this third aspect protection part preferably has the rubber part that is arranged in along the inboard of tire width direction and is made of solid rubber and is arranged in along the outside on the tire width direction and is made of the rubber of softness.
In this case, the solid rubber of rubber part preferably has 100% modulus that is not less than 3.0MPa in constituting, and the soft rubber of formation outer rubber part preferably has 100% modulus less than 3.0MPa.Interior rubber part preferably is not less than 40% with respect to the percent by volume of whole wheel rim protection part.Interior rubber part preferably forms by the rubber bead infantees is extended towards direction radially outward, and the outer rubber part preferably forms by the exocuticle rubber that constitutes the sidewall part is extended towards inward direction radially.And, preferably be arranged on compound enhancement layer interior and outer rubber part between.
Second and the third aspect in, preferably: (i) the enhancing element that constitutes compound enhancement layer is a non-woven fabric; The enhancing element that (ii) constitutes compound enhancement layer is the filament fiber that 0.01-1mm and fibre length are not less than 1mm for its fibre diameter; And/or (iii) compound enhancement layer so is provided with, that is, it surrounds on the external peripheral surface of wheel rim protection part.
In first, second and the third aspect, preferably will be wherein a pair of narrow enhancing bracing ply that extends abreast of the circumferencial direction of cord and tire be arranged on the position that each all covers the end of this bracing ply, and along the Width of tire from the tread width end position extremely the distance measured of the inner end positions of narrow enhancing bracing ply be not less than 1/4 of tread width.In addition, when be provided with on the tread portion a plurality of during along vertical main groove that tire circumferential direction extends, narrow enhancing bracing ply preferably so is provided with, that is, it is inwardly laid from the width centreline at the vertical main groove of outermost of tire width direction along the inner of tire width direction.
In addition, in first, second and the third aspect, tire is preferably the air-inflation tyre that comprises a carcass, and this carcass has therein pair of sidewall part that embeds the carcass plies of one deck at least that extends ringwise on the pair of bead portions that bead core is arranged, extends radially outward from bead part and the tread portion that extends across the sidewall part.Given air pressure is gone up and be filled with to this mounting of tyre at adjustment wheel rim (regulatedrim).In the cross-sectional plane that tire/wheel assembly is cut open along tire width direction under idle condition; protect in the specific region that partly is set on the outer surface of tire along the wheel rim of the outwardly directed annular of tire width direction, this zone extends to the extreme higher position of the outside face that contacts with the outside face of wheel rim from tire maximum width position on the outer surface.When the circular arc that draws with the outside face of determining tire maximum width position and wheel rim and suppose that this circular arc be the reference circular arc of profile of the outside face of approximate specific region (except wheel rim protection partly); then in this specific region with many straight normals of auxiliary circle sag on the minimum value and the peaked ratio of measured tire thickness be preferably 0.8 to 1.0; and as the distance between the end face of reference circular arc and the wheel rim measured from the normal that the reference circular arc draws protection part, the maximum height of wheel rim protection part is preferably the tire thickness of measuring on the normal identical with maximum height 0.52-1.40 doubly.
As used herein the same, term " adjustment wheel rim " and " given air pressure " refer to respectively JATMA (Japanese Automobile Tire manufacturers Association) YEAR BOOK (2002) defined standard rim and with the cooresponding air pressure of maximum load capability (maximum gas pressure).
The maximum height of wheel rim protection part preferably is restricted to the tire thickness of measuring on identical normal 0.58-1.20 doubly, this scope is narrower than above-mentioned scope.
Center-line-average by wheel rim protection part that wheel rim protection part is obtained divided by the length of bottom on the reference circular arc of wheel rim protection part along the cross-sectional plane of tire width direction intercepting is preferably 0.6 times of the maximum height that is not less than wheel rim protection part and less than 1.0 times of this maximum height.
Wheel rim protection part preferably has trapezoidal substantially or leg-of-mutton substantially cross sectional shape.In the situation in front, more preferably, the length of end face in the cross-sectional plane that intercepts along tire width direction that wheel rim protects the end face of part to form plane and/or wheel rim protection part is 0.14 to 0.90 times of above-mentioned bottom lengths.
Preferably form a smooth curve at the outside face of tire and the boundary member between the wheel rim protection external peripheral surface partly.
Reinforced Rubber preferably has 100% modulus that is not less than 4MPa.
In addition, the carcass plies of one deck at least in the multilayer carcass plies of formation carcass preferably includes the organic fiber cord that is selected from 6-nylon, 66-nylon, polyethylene terephthalate, rayon, PEN and aromatic poly amide.
Brief description of drawings
Fig. 1 is the cutaway view according to the left side of the run-flat tire of first aspect present invention;
Fig. 2 is the scheme drawing under the situation of straight (straight beam) for the specific region in hypothesis tire sidewall part;
Fig. 3 is for being the scheme drawing under straight the situation in the specific region of hypothesis sidewall part and the wheel rim protection part that is located on the whole specific region;
Fig. 4 is in the specific region of hypothesis sidewall part with only to be set in place wheel rim protection part on the part at the fixed part side place of specific region be scheme drawing under straight the situation;
Fig. 5 is the cutaway view according to the left side of the run-flat tire of second aspect present invention;
Fig. 6 is the cutaway view according to the main portion that comprises wheel rim protection part of the run-flat tire of third aspect present invention;
Fig. 7 is the cutaway view according to the main portion that comprises wheel rim protection part of another run-flat tire of third aspect present invention;
Fig. 8 demonstrates another embodiment;
Fig. 9 demonstrates another embodiment;
Figure 10 demonstrates another embodiment;
Figure 11 demonstrates another embodiment;
Figure 12 demonstrates another embodiment;
Figure 13 demonstrates another embodiment;
Figure 14 demonstrates another embodiment;
Figure 15 is an instruction diagram, demonstrates traditional run-flat tire at the deformation state that loses heart during travelling;
Figure 16 is an instruction diagram, demonstrates run-flat tire according to the present invention in the example of the deformation state during travelling of losing heart;
Figure 17 demonstrates another embodiment;
Figure 18 is the cutaway view when the protection of wheel rim when the sidewall of the run-flat tire shown in Figure 17 part is launched part; And
Figure 19 is the cutaway view of the left side of conventional tire (traditional embodiment).
Preferred embodiment
Fig. 1 is the cutaway view according to the left side of the run-flat tire of first aspect present invention.Be provided with at the run-flat tire shown in Fig. 11: a carcass 7, it is gone up the carcass plies of one deck at least (being two-layer carcass plies 6a, 6b in Fig. 1) that annular extends and constitutes by embedding the pair of bead portions 3 (only demonstrating one of them) that bead core 2 is arranged therein: a pair of sidewall part 4 (only demonstrating one of them) that extends radially outward from bead part 3 and a tread portion 5 that extends across these sidewall parts 4.
Being provided with the bracing ply 8 that is made of one deck cordline at least between the crown of carcass 6 and tread portion 5, is two-layer cordline 8a, 8b in Fig. 1.In addition, to have substantially that the Reinforced Rubber 11 of crescent section shape is arranged on the inner surface side of sidewall part 4 at least, and be located at the inside face 7a of carcass and stride across between the inside liner 10 of bead part 3 and in Fig. 1, and then be positioned at below the end of bracing ply 8.Like this, tire has the structure of so-called enhancing sidewall type run-flat tire.
In addition, though on tread portion 5, be provided with four vertical main groove 12a, the 12b (only demonstrating wherein two main grooves) that extend along the circumferencial direction of tire at the tire shown in Fig. 11, but the quantity of main groove 12a, 12b can change, and can other tread void be set according to various structures in case of necessity, for example unshowned cross groove and inclination groove.
And, in being applied to tire state on the standard rim R therein, the outwardly directed annular rim of tire width direction protection part 13 is arranged in the and then outer surface position place of wheel rim Rf top.
Architectural feature of the present invention is to optimize the wheel rim protection part 13 on the outside face 4a of the sidewall part 4 that is located at tire 1, so that it is impaired owing to contact with obstacle (for example curb) to prevent tire 1 and/or wheel rim R.More particularly, in first aspect, wheel rim protection part 13 is formed by solid rubber, and 100% modulus of this solid rubber is not less than 3.0MPa, and is two to five times of 100% modulus of the exocuticle rubber 14 of formation sidewall part 4.In second aspect, be disposed in position near at least a portion circumferential surface 15 of wheel rim protection part 13 by comprising the compound enhancement layer 16 of one deck at least that the rubber that strengthens element constitutes.In the third aspect; at least a portion wheel rim protection part 13 is formed by solid rubber; 100% modulus of this solid rubber is not less than 3.0MPa; and be two to five times of 100% modulus of the exocuticle rubber that constitutes sidewall part 4, and be disposed in the wheel rim protection part 13 or be arranged in the position of protecting at least a portion circumferential surface of part 13 near wheel rim by comprising the compound enhancement layer 16 of one deck at least that the rubber that strengthens element constitutes.
Pass through said structure, first, second and the third aspect of the present invention can be improved owing to hang down tire pressure or expose Runflat durability during travelling continuously under the disappointing condition that causes, and can not sacrifice further feature, for example under normal air pressure, carry out the ride comfort during routine is driven.
Below will to how said structure being applied to the present invention and operation describes.
Inventor's labor owing to low tire pressure or expose and travel continuously under the air deflating state that causes and the situation of damaged tire.The result, have been found that in the enhancing sidewall type run-flat tire that sidewall part rigidity strengthens, damaged tyres is seldom caused by the so-called tyre bead dislocation that drop center portion is wherein separated wheel rim, but the destruction that the representative type defective pattern begins for maximum width position and its adjacent part from tire as mentioned above.This destruction appears to because the deflection of the sidewall part of tire and distortion cause greater than deflection under the inside casing spare of conventional design and distortion.
From the tread portion to the shoulder wedge (buttress) part be provided with bracing ply and measure thickness (gauge thickness) with high rigidity bigger, thereby rigidity is higher.Bead part also has high rigidity, because it also is provided with reinforcement except the casingply of high rigidity bead apex and upset, and chafer for example.Yet, the sidewall part, especially in the maximum width position of tire and the vicinity form by a small amount of member and have less measurement thickness, relatively low thereby rigidity becomes.In common tire, the inside face of tire is in contact with one another repeatedly owing to sidewall part insufficient rigidity, thereby causes damaged tyres.In strengthening sidewall type run-flat tire, be in contact with one another though prevented inside face, the deflection in maximum width position and vicinity thereof keeps bigger, therefore still occurs there damaging.
Therefore, in order to improve the Runflat durability, the increase of tire weight and the reduction of capacity rating are minimized, importantly, under the situation that keeps whole tire stiffness the less relatively place of formation rigidity, part place, sidewall that is extending across shoulder wedge partial sum bead part simultaneously, constitute this tire, thereby reduced deflection and distortion in maximum width position and vicinity thereof.
Consider the distortion of tire, suppose that the tread surface and the wheel rim bonding part of contact landing ground is fixed part.But, the inventor has studied the distortion that is suppressed at tire maximum width position in addition, and finds directly to increase measurement thickness in the maximum width position to improve rigidity more effective by improving deformation ratio that rigidity as the fixed part of distortion root is suppressed at the maximum width position indirectly.In this case, near the part of fixed part is the shoulder wedge part of closing on tread portion and bead part.The inventor has obtained such design, that is, improve near the rigidity (rigidity of this wheel rim is apparently higher than the rigidity of tire) of the part bead part wherein be assemblied on the wheel rim and can effectively be suppressed at distortion on the maximum width direction.In addition, be increased in the measurement thickness that shoulder wedge part and especially maximum width partly locate and can cause bigger rigidity and inertial mass, this can reduce ride comfort.On the contrary, increase measurement thickness and be believed to cause these counter productives.
The inventor has studied to be used for effectively improving in the method for the rigidity of locating as near the root of the bead part of fixed part (part) and to find to optimize and has been called as the wheel rim guard member and is located at wheel rim protection part 13 on the outside face of tire sidewall part so that prevent tyre and rim owing to contact and the impaired bending stiffness that can obviously increase bead part 3 with obstacle (for example curb); thereby suppress sidewall part 4 effectively in the deflection and the distortion of losing heart during travelling, can cause damaged tyres hardly thus.
But when wheel rim protection part 13 is only formed when improving the rigidity of bead part 3 by solid rubber, the longitudinal spring stiffness coefficient especially increases under the normal air pressure condition, thereby causes tyre evenness and ride comfort and vibration characteristic reduction.Therefore, importantly, wheel rim protection part 13 be so optimized, that is, the function of the bending stiffness of the root that improves bead part 3 can be applied effectively.
For simplicity, as shown in Figure 2, lateral parts (its radical length is L) on the specific region 20 of the highest part 19 of the outside face that is contacting wheel rim 18 from maximum width part 17 to outer surface of tire downcuts a circumferential unit length (for example, 10mm).Suppose that lateral parts at 20 places, specific region that comprise casingply and bead apex is to have even straight of thickness t.Wherein wheel rim is protected part 13 to be arranged in the situation on above-mentioned straight the whole area L that thickness is h as shown in fig. 3 and as shown in fig. 4 wherein the volume of wheel rim protection part 13 keep identical and be located at its length be above-mentioned straight be to study bending stiffness the situation of 1/k area L/k doubly last (wherein k is the numeral greater than 1) of the length that begins of this fixed end of straight of kh from thickness.
Each part of supposing this has identical performance, then can regard bending stiffness as geometrical moment of inertia.By suitably being similar to and the simplified construction formula, obtained following described geometrical moment of inertia in stacked state:
I
0＝(1/12)t
3
I
1＝(1/12)t
3+(1/12)h
3+{(t+h)/2}
2h
I
2＝(1/12)t
3+(1/12)(kh)
3+{(t+kh)/2}
2kh
When tire sank owing to load and is out of shape, moment of deflection M acted on the maximum width position of tire, thereby as follows along the drum amount that rises (amount of collapsing) δ of tire axial:
δ
1＝(M/2EI
1)(L/k)
2+(M/2EI
0)(L-L/k)
2+(M/2EI
1)(L-L/k)(L/k)
δ
2＝(M/2EI
2)L
2
f(t，h，k)＝δ
1-δ
2
Use these relational expressions and judge as shown in Figure 3 like that wherein lug boss (wheel rim protection part) be located in the situation on whole and when like that wherein keeping volume identical as shown in Figure 4, it be located at the magnitude relationship between these distortion in the situation on a part of bar, thereby obtain following relation:
g(t，h，k)＝(1/k
2){I
0I
2+2(k-1)+I
1I
2(k-1)
2-I
0I
1k
2}
The inventor is also by substituting j=h/t and make the thickness nondimensionalization carry out numerical analysis, and finds that the wheel rim protection part 13B by as shown in Figure 4 narrow and thick can suppress deflection and distortion more effectively than the wide thin wheel rim protection part 13A by as shown in Figure 3.
Because above-mentioned estimated result is to obtain by the simple form that a part of lateral parts with tire is modeled as with regard to strength of material, so the inventor tests the tire of making and having tested according to above-mentioned design.Then, they are devoted to study the optimization to wheel rim protection part, and it can effectively suppress the distortion of sidewall part down and can bring into play the durability of improvement in the confined volume (weight) of wheel rim protection part.
Therefore; can improve effectively in success under the situation of not sacrificing other characteristic (ride comfort during especially for example carrying out conventional the driving under the normal air pressure) in the following manner since low tire pressure or expose cause travelling continuously under the disappointing condition during the Runflat durability; promptly; form wheel rim protection part 13 with solid rubber and make 100% modulus of this solid rubber be not less than 3.0MPa and be in two to five times of scopes of 100% modulus of the exocuticle rubber 14 that constitutes sidewall part 4 according to first aspect; perhaps will be arranged near near the position at least a portion circumferential surface 15 of wheel rim protection part 13 by comprising at least one compound enhancement layer 16 that the rubber that strengthens element constitutes according to second aspect; perhaps form wheel rim protection part 13 with solid rubber according to the third aspect; make 100% modulus of this solid rubber be not less than 3.0MPa and be in two to five times of scopes of 100% modulus of the exocuticle rubber that constitutes sidewall part 4, and will be arranged in the wheel rim protection part 13 or be arranged in the position of protecting at least a portion circumferential surface of part 13 near wheel rim by comprising the compound enhancement layer 16 of one deck at least that the rubber that strengthens element constitutes.
The reason that the formation wheel rim protects 100% modulus of the solid rubber of part 13 to be not less than 3.0MPa in first aspect is; be not less than 3.0MPa so that can be reduced in the circumferential shear deformation of the local deformation of tyre during sidewall part, especially Reinforced Rubber 11 of travelling of losing heart by 100% modulus is set at, thereby wheel rim protection part 13 can be out of shape hardly.In addition; the rigidity that increases wheel rim protection part 13 under normal air pressure to the influence of the longitudinal spring stiffness coefficient of tire less than the influence of Reinforced Rubber 11 to it, thereby this tire under normal air pressure, carry out routine travel during with have the conventional tire that is equal to the Runflat durability and compare have lower longitudinal spring rigidity (the circumferential rigidity of tire) and better ride comfort.
But the structure of independent above-mentioned first aspect is not enough aspect durability.Therefore; in order to reduce owing to the exocuticle rubber that constitutes the sidewall part and to constitute the danger that for example separates that wheel rim protects the rubber performance of the rubber of part to cause; give full play to effect of the present invention simultaneously, 100% modulus that must make the solid rubber that constitutes wheel rim protection part in first aspect is two to five times of 100% modulus of the exocuticle rubber that constitutes the sidewall part.That is to say that two to five times of 100% modulus that 100% modulus of solid rubber that can be by will constituting wheel rim protection part be limited in the exocuticle rubber that constitutes the sidewall part travel balance between the durability of the ride comfort and lose heart of optimization under normal air pressure.
In second aspect, different with first aspect, as shown in Figure 5, the rubber that constitutes wheel rim protection part 13 is unrestricted.On the contrary, will be arranged in position by comprising the compound enhancement layer 16 of one deck at least that the rubber that strengthens element constitutes near at least a portion circumferential surface 15 of wheel rim protection part 13.That is to say, though being located at the rubber of side surface part office is compressed and trends towards to move to the other parts of the exocuticle outside or tire, this motion is so-called drum distortion, therefore when the big macrobending of lateral parts, can prevent the expansion of rubber and can be suppressed at longitudinal spring stiffness coefficient under the Runflat condition effectively.Therefore, the tire of second aspect can be brought into play the effect identical with first aspect.It is to be noted, being arranged in of compound enhancement layer 16 carry out under the normal air pressure routine travel during effect aspect the longitudinal spring stiffness coefficient very little, therefore can remain on ride comfort good under the cruising.As used herein the same, term " circumferential surface of wheel rim protection part " refers to the external peripheral surface 15a and the inner circumferential surface 15b of such as shown in fig. 1 wheel rim protection part 13.
In addition, if the layout both of the optimization of 100% modulus of solid rubber and compound enhancement layer 16 as being met, then can further improve the Runflat durability by its synthetic effect in the third aspect.In the third aspect, all wheel rims protection part in Fig. 5 13 is formed by solid rubber.Rubber is generally incompressible material, and it changes its volume hardly when distortion, and is well known that the combination and independent use rubber phase ratio of rubber and enhancement layer, so because its synthetic effect can significantly improve compression stiffness.Therefore; constitute and be positioned at the rubber part 31 of tire width direction inboard and constitute and when being positioned at the outer rubber part 32 in the tire width direction outside when wheel rim protection part 13 is formed with by solid rubber by the rubber of softness; the distortion of rubber part in can preventing by compound enhancement layer; thereby improve the rigidity of whole wheel rim protection part; and the compound enhancement layer that can prevent that the outer rubber that causes owing to big collision from partly tearing up and cause owing to the slight scratch of wheel rim exposes, thereby has kept the outward appearance of tire.In addition, when wheel rim protection part 13 has said structure, improve the lateral stiffness of tire simultaneously, improved turning performance thus.
The solid rubber of rubber part 31 preferably has 100% modulus that is not less than 3.0MPa in constituting, and the soft rubber of formation outer rubber part 32 preferably has 100% modulus less than 3.0MPa.If 100% modulus of the solid rubber of rubber part 31 is not less than 3.0MPa in constituting, then wheel rim protection part 13 is out of shape hardly.If 100% modulus of soft rubber that constitutes outer rubber part 32 is less than 3.0MPa, even then also can improve the effect that prevents that compound enhancement layer from exposing in scratch such as wheel rim protection part and curb or when contacting.
And interior rubber part 31 preferably is not less than 40% with respect to the volume ratio of whole wheel rim protection part 13, even because can fully guarantee the rigidity of wheel rim protection part 13 like this and apply also distortion hardly under the big case of collision.
Interior rubber part 31 preferably forms by rubber bead infantees 33 is extended towards direction radially outward, and outer rubber part 32 preferably forms by the exocuticle rubber 14 that constitutes sidewall part 3 is extended towards inward direction radially.By these structures, needn't increase any new member, thereby improve capacity rating.
If the cross sectional shape of interior rubber part 31 is a complicated shape, for example the same as shown in Figure 6 and wheel rim is protected the substantially similar shape of cross sectional shape of part 13, and the enhancing element that then constitutes compound enhancement layer 16 is preferably non-woven fabric.When the enhancing element that constitutes compound enhancement layer 16 was formed by non-woven fabric, this compound enhancement layer 16 can change its shape at an easy rate adapting to the irregular section shape, so its layout becomes easier.About this non-woven fabric, can adopt aromatic poly amide, polyethylene terephthalate (PET), PEN (PEN) etc.
Fig. 7 demonstrates therein with another the airtyred main portion according to third aspect present invention in the state of mounting of tyre on wheel rim.As shown in Figure 7, when the cross sectional shape of interior rubber part 31 was simple, the enhancing element that constitutes compound enhancement layer 16 was preferably steel or organic cord.When the cross sectional shape of interior rubber part 31 has a small amount of depression and projection, adopt the compound enhancement layer of steel or organic cord in addition can be easy to be arranged and suppress in addition in the effect of cubic deformation of rubber part 31 greater than the described effect of non-woven fabric.
Though Fig. 6 and 7 demonstrates the embodiment that wherein compound enhancement layer 16 extends in sidewall part 4, compound enhancement layer 16 can just be embedded near in the position of at least a portion of the outside face of interior rubber part 31 and needn't extend in sidewall part 4.
The enhancing element that constitutes compound enhancement layer 16 can be arranged along specific direction similarly with the cord in being coated with the cordline of rubber.But with regard to material science, the preferred use do not have anisotropic non-woven fabric to improve bending and torsional stiffness effectively.In addition, it is the filament fiber that 0.01-1mm and its fibre length are not less than 1mm that the enhancing element that constitutes compound enhancement layer 16 is preferably its fibre diameter, aramid fibre or polyethylene terephthalate (PET) fiber for example, and be preferably aramid fibre with high rigidity.
As used herein the same; compound enhancement layer is arranged to surround on the outside face 15a of wheel rim protection part 13 and specifically refers to, the enhancing element of compound enhancement layer be provided with the position with respect to and the outside face side of the 70% cooresponding position of wheel rim guard member height hmax and in the position of external peripheral surface 15a and in and be between the position in the wheel rim protection part with it apart from the scope of 3mm.Compound enhancement layer 16 self can be located on the external peripheral surface 15a of wheel rim protection part 13, perhaps can be embedded in the wheel rim protection part 13.
When require compound enhancement layer 16 can prevent owing to the outside face of tyre bead and wheel rim between contact cause damage the time; this layer can extend on wheel rim is protected the outside face of the circumferential surface 15 of part 13 and the bead part that is contacting wheel rim R, as shown in Figure 11-13.In addition, the outside face 15a that therein compound enhancement layer 16 is arranged on wheel rim protection part 13 goes up and need improve in the situation of the outward appearance of tire, weather-resistant performance etc., rubber layer 21 can be set cover compound enhancement layer, as shown in Figure 14.
From improving the viewpoint of high speed durability etc., the wide enhancing bracing ply 22 that at least one covers the whole outer surface of bracing ply 8 can be set, and can arrange that at least one pair of narrow enhancing bracing ply is two couples of narrow enhancing bracing ply 23a, 23b (wherein the circumferencial direction of cord and tire extends abreast) in Fig. 5 in the position of each end that covers bracing ply 8.In this case, for at least one pair of narrow enhancing bracing ply 23b of narrow enhancing bracing ply 23a, 23b, from reducing the strain viewpoint of Reinforced Rubber 11, the distance X that the inner end positions 24 along tire width direction from tyre surface end position 25 to bracing ply 23b is measured preferably is not less than 1/4 of tread width W.That is to say, in traditional run-flat tire, as shown in Figure 15 like that lose heart travel during warpage (promoting distortion) trend towards appearing at and close on the tread portion that is arranged near the shoulder wedge the Reinforced Rubber.Can be set at by distance X that will the inner end positions from tyre surface end 25 to bracing ply 23b 24 is measured along tire width direction and be not less than 1/4 of tread width W and prevent this warpage, further improve the Runflat durability thus.
In addition, when when the vertical main groove of many of extending along tire circumferential direction is set on the tread portion 5, the local bending distortion of the position of the vertical main groove 12b of the outermost with on the tire width direction as shown in figure 15 as its starting position appears easily.In this case, when the inner 24 with narrow enhancing bracing ply 23b is arranged on along the groove middle position 26 of the vertical main groove 12b of the outermost of tire width direction when inboard, this flexural deformation can occur hardly, thereby has further improved the Runflat durability.
It has been generally acknowledged that the even standard profile without any notable difference is being desirable aspect the essential structure of tire from the shoulder wedge part to bead part.But the inventor finds, on more rubber being applied to the tire that has substantially standard profile uniformly when improving durability, not by under situation, increasing whole measurement thickness equably without any special reason, but increase the measurement thickness of main portion, thereby improve durability effectively by the concentrated area.The result; the inventor also finds; during specific region 20 when so be arranged on the outside face 4a of tire of extreme higher position 19 (its maximum height hmax has to certainty ratio with respect to the tire thickness t) that tire maximum width position 17 on being positioned at outside face 4a extends to the outside face that contacts with the outside face 18 of wheel rim along the wheel rim of the outwardly directed annular of tire width direction protection part 13 on; can suppress the deflection and the distortion of tyre side face portion, thereby improve durability effectively.That is to say; under the uniform as far as possible condition of the tire thickness t that is positioned at above-mentioned specific region 20; and more particularly when the circular arc that draws with the scope of the outside face 18 that limits tire maximum width position 17 and wheel rim and when supposing this circular arc for the reference circular arc C of the profile of the outside face 4a of approximate specific region 20 (except wheel rim protection part 13); in specific region 20 many with the normal vertical with reference to circular arc C on the minimum value of the tire thickness t measured be 0.8 to 1.0 to peaked ratio, and the 0.52-1.40 that is preferably the tire thickness of measuring at identical normal as the maximum height hmax of the wheel rim protection part of the distance of measuring along the normal m that draws from the reference circular arc between the end face 28 of reference circular arc C and wheel rim protection part 13 is doubly.By these structures, can suppress the deflection and the distortion of the lateral parts of tire, with the further durability that improves.As the maximum height hmax of wheel rim protection part 13 during less than 0.52 times of tire thickness t, the effect of improving durability is less.On the other hand, when it surpassed 1.40 times of tire thickness t, deflection was identical with the distortion maintenance, but durability may reduce.
The volume of supposing wheel rim protection part 13 keeps constant, then wheel rim is protected the maximum height hmax of part 13 to be restricted in the 0.58-1.20 scope doubly of the tire thickness t of measuring on identical normal and can further be improved durability.The cross-sectional area of wheel rim protection part 13 is preferably 0.4-1.5cm when seeing in the cross section of tire width direction
2(0.4 * 10
-4-1.5 * 10
-4m
2).
As shown in figure 18, the center-line-average ha by the wheel rim protection part 13 that will obtain divided by the length B of bottom 29 on the reference circular arc C of wheel rim protection part 13 along the cross-sectional area S of the protection of the wheel rim in the cross-sectional plane of tire width direction intercepting part 13 is preferably 0.6 times of the maximum height that is not less than wheel rim protection part and less than 1.0 times of this maximum height.
In the present invention, importantly to optimize height (thickness) distribution of wheel rim protection part 13.In order to make wheel rim protection layout partly directly help the increase of bending stiffness, requirement is the least possible in the thin-walled portion of the height lower of wheel rim protection part 13.For this reason, the center-line-average ha of wheel rim protection part 13 preferably is not less than 0.6 times of maximum height hmax of wheel rim protection part 13.In addition; the center-line-average ha of wheel rim protection part 13 is preferably less than 1.0 times of the maximum height hmax of wheel rim protection part 13, because can bring into play the effect of bigger increase rigidity when 29 length B is greater than the length T of the end face 28 of wheel rim protection part 13 in the bottom.
Wheel rim protection part 13 preferably has the trapezoidal cross-sectional shape of being substantially (Figure 17) or is substantially leg-of-mutton cross sectional shape (Fig. 1).When wheel rim protection part 13 had the trapezoidal cross-sectional shape of being substantially, the end face 28 of wheel rim protection part 13 was preferably in 0.14 to 0.90 times the scope of smooth shape and the length B of wheel rim protection part 13 bottom the length T of the end face in the cross section of tire width direction is preferably in.If it is less than 0.14 times, then this trapezoidal top is less, so the effect of bar becomes littler.On the other hand, if it surpasses 0.90 times, then the appearance line that extends between lateral parts and wheel rim protection part can not form a straight line, thereby has the danger that cracks.
Boundary member 30 between the external peripheral surface 15a of outside face 4a and wheel rim protection part 13 preferably forms level and smooth curve, because stress trends towards concentrating thereon.
The Reinforced Rubber 11 that its 100% modulus is not less than 4MPa is depressed in common and is guaranteed that aspect the ride comfort be preferred, because it gives Reinforced Rubber relatively thin measurement thickness.
In addition, the one deck at least that constitutes the multilayer carcass plies of carcass 7 preferably includes the organic fiber cord that is selected from the group that is made of 6-nylon, 66-nylon, polyethylene terephthalate, rayon, PEN and aromatic poly amide, so that prevent body cord bending during disappointing travelling.
Though exemplary of the present invention is illustrated above, under the situation that does not break away from the scope of the invention that is defined by the following claims, can carries out many changes and improvements.For example; the present invention is by optimizing the local deformation that the wheel rim guard member has reduced Reinforced Rubber; thereby, perhaps can reduce the weight of tire by the thickness that reduces Reinforced Rubber by using the Reinforced Rubber more soft can improve in the ride comfort of carrying out under the normal air pressure during routine is travelled than traditional rubber.
Embodiment
Test is made pneumatic tires according to the present invention and is assessed their performance.To be elaborated below.
(test tire)
The tire of each embodiment is to strengthen sidewall type tire, and the size of tire is 215/45ZR17, and its parameter is as shown in table 1.In each of these tires, carcass is made of the casingply of one deck upset, bracing ply has the cordline of rubber to constitute by two-layer coating, wherein this two-layer cordline is so stacked, promptly, make cord with respect to downward-sloping 26 degree of tire circumferential direction and crossing between these layers, strengthening bracing ply is wide enhancing bracing ply and two narrow enhancing bracing plys, on tread portion, be provided with four vertical main grooves, and paired narrow enhancing bracing ply is arranged to its inner and is arranged on the inboard of the width center of vertical main groove along tire width direction.In the tire of embodiment 11; the outer rubber part that interior rubber part that the solid rubber that it is 6.0MPa that wheel rim protection part has by its 100% modulus constitutes and the soft rubber that is 1.6MPa by its 100% modulus constitute; interior rubber part is 50: 50 with respect to the volume ratio of outer rubber part, and compound enhancement layer is arranged in interior and the outer rubber part between.Other structure of these tires is similar with the common run-flat tire (air-inflation tyre) that is used for passenger vehicle.
(assessment)
Above-mentioned test tire is assemblied on the standard rim, and is that 0kPa (relative pressure), load are that 4.17kN and moving velocity are to rouse commissioning test under the test condition of 90km/h in interior pressure.Measure operating range, and estimate out the Runflat durability by the distance of measuring up to rupture of tire.In interior pressure is that 230kPa and load are to calculate the longitudinal spring stiffness coefficient under the 3.7kN, and is assessed out in the ride comfort of carrying out under the normal air pressure during routine is travelled by the stiffness coefficient that calculates.For reference, also the outward appearance of tire weight and wheel rim protection part is assessed.Carry out the outward appearance assessment of wheel rim protection part in such a way: above-mentioned test tire is assemblied on the standard rim to form tire/wheel assembly, then they is installed on the test vehicle; Apply the interior pressure of 230kPa (relative pressure) and the load of 4.17kN; These vehicles are travelled with the speed of 10km/h, thereby the test tire is impinged upon on the high curb of the 10cm that is arranged on the road with 75 degree angles; Visually observe the damage of wheel rim and the outward appearance of wheel rim protection part then.
Be displayed in Table 1 out assessment result.Result in the table 1 represents by desired value, and wherein the result with the tire of traditional embodiment is set at 100.The result is big more, and then the Runflat durability is good more.The result is more little, and ride comfort and weight are good more.The outward appearance of wheel rim protection part is evaluated as Three Estate A, B and C.A is a best result, and C is the poorest result.
Table 1
| Tradition embodiment | Comparing embodiment | Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | |
| Tire construction | Figure 19 | Figure 17 | Fig. 1 | Fig. 1 | Fig. 1 | Fig. 1 | Fig. 5 |
| The modulus (MPa) of wheel rim protection part | 1.6 | 1.6 | 6.0 | 3.2 | 6.0 | 6.0 | 1.6 |
| Constitute the modulus (MPa) of the exocuticle rubber of sidewall part | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 |
| Compound enhancement layer | Do not have | Do not have | Do not have | Do not have | Do not have | Do not have | Non-woven fabric |
| The maximum of Reinforced Rubber is measured thickness (mm) | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 |
| Distance X (mm) | 30 | 30 | 30 | 30 | 40 | 60 | 30 |
| Ratio (%) W=160mm of distance X/tread width W | 19 | 19 | 19 | 19 | 25 | 33 | 19 |
| The inner of narrow enhancing bracing ply (with respect to the position at the width center of the vertical main groove of outermost) | The outside of broad ways | The outside of broad ways | The outside of broad ways | The outside of broad ways | The inboard of broad ways | The inboard of broad ways | The outside of broad ways |
| Tire weight | 100 | 102 | 102 | 102 | 102 | 103 | 102 |
| Frame in the cruising process is taken advantage of traveling comfort | 100 | 100 | 101 | 100 | 100 | 100 | 100 |
| The Runflat durability | 100 | 102 | 140 | 125 | 145 | 152 | 140 |
| The outward appearance of wheel rim protection part | - | A | A | A | A | A | B |
Table 1 (continuing)
| Embodiment 6 | Embodiment 7 | Embodiment 8 | Embodiment 9 | Embodiment 10 | | |
| Tire construction | Fig. 5 | Fig. 9 | Fig. 9 | Figure 10 | Figure 10 | Fig. 6 |
| The modulus (MPa) of wheel rim protection part | 6.0 | 1.6 | 60 | 1.6 | 6.0 | 6.0/1.6 |
| Constitute the modulus (MPa) of the exocuticle rubber of sidewall part | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 | 1.6 |
| Compound enhancement layer | Non-woven fabric | Non-woven fabric | Non-woven fabric | Non-woven fabric | Non-woven fabric | Non-woven fabric |
| The maximum of Reinforced Rubber is measured thickness (mm) | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 | 8.0 |
| Distance X (mm) | 30 | 30 | 30 | 30 | 30 | 30 |
| Ratio (%) W=160mm of distance X/tread width W | 19 | 19 | 19 | 19 | 19 | 19 |
| The inner of narrow enhancing bracing ply (with respect to the position at the width center of the vertical main groove of outermost) | The outside of broad ways | The outside of broad ways | The outside of broad ways | The outside of broad ways | The outside of broad ways | The outside of broad ways |
| Tire weight | 102 | 101 | 101 | 101 | 101 | 101 |
| Travelling comfort in the cruising process | 100 | 100 | 100 | 100 | 100 | 100 |
| The Runflat durability | 155 | 110 | 145 | 109 | 142 | 140 |
| The outward appearance of wheel rim protection part | B | B | B | A | A | A |
From among the results shown in the table 1 as can be seen, all embodiment all have the overall balance performance of the excellence of Runflat durability, the ride comfort during routine is travelled and tire weight.In addition, its wheel rim protection part of the tire of embodiment 1-4 and 9-11 can keep good surface appearance.
Industrial applicibility
According to the present invention, a kind of like this run flat can be provided, namely, it is owing to low tire pressure or expose the Runflat durability that has effective improvement during travelling continuously under the disappointing condition that causes, and can not sacrifice other characteristic, for example under normal air pressure, carry out the ride comfort during routine is travelled.
Claims (23)
1. run-flat tire, it comprises: a bracing ply, it is made of the cordline that the one deck at least between crown that is laid on carcass and the tread portion is coated with rubber, and the pair of sidewall part and that described carcass has the carcass plies of one deck at least that extends ringwise on the pair of bead portions of bead core by embedding therein, extend radially outward from bead part is crossed the tread portion that the sidewall part extends and constituted; One Reinforced Rubber, it has and is essentially meniscate cross sectional shape and is disposed in the inner surface side place of sidewall part at least; And the wheel rim protection part of an annular, this part is protruding and therein tire is applied to the outer surface position place that is arranged in the tire that tightly is positioned at the wheel rim top in the state on the standard rim along tire width direction, and this tire is characterized in that,
Described wheel rim protection part is formed by solid rubber, and
100% modulus of this solid rubber is not less than 3.0MPa, and in two to five times scope of 100% modulus of the exocuticle rubber that constitutes the sidewall part.
2. run-flat tire, it comprises: a bracing ply, it is made of the cordline that the one deck at least between crown that is laid on carcass and the tread portion is coated with rubber, and the pair of sidewall part and that described carcass has the carcass plies of one deck at least that extends ringwise on the pair of bead portions of bead core by embedding therein, extend radially outward from bead part is crossed the tread portion that the sidewall part extends and constituted; One Reinforced Rubber, it has and is essentially meniscate cross sectional shape and is disposed in the inner surface side place of sidewall part at least; And the wheel rim protection part of an annular, this part is protruding and therein tire is applied to the outer surface position place that is arranged in the tire that tightly is positioned at the wheel rim top in the state on the standard rim along tire width direction, and this tire is characterized in that,
To be arranged in position by comprising the compound enhancement layer of one deck at least that the rubber that strengthens element constitutes near at least a portion circumferential surface of wheel rim protection part.
3. run-flat tire, it comprises: a bracing ply, it is made of the cordline that the one deck at least between crown that is laid on carcass and the tread portion is coated with rubber, and the pair of sidewall part and that described carcass has the carcass plies of one deck at least that extends ringwise on the pair of bead portions of bead core by embedding therein, extend radially outward from bead part is crossed the tread portion that the sidewall part extends and constituted; One Reinforced Rubber, it has and is essentially meniscate cross sectional shape and is disposed in the inner surface side place of sidewall part at least; And the wheel rim protection part of an annular, this part is protruding and therein tire is applied to the outer surface position place that is arranged in the tire that tightly is positioned at the wheel rim top in the state on the standard rim along tire width direction, and this tire is characterized in that,
At least a portion wheel rim protection part is formed by solid rubber,
100% modulus of this solid rubber is not less than 3.0MPa, and in two to five times scope of 100% modulus of the exocuticle rubber that constitutes the sidewall part, and
To be arranged in the wheel rim protection part or be arranged in position by comprising the compound enhancement layer of one deck at least that the rubber that strengthens element constitutes near at least a portion circumferential surface of wheel rim protection part.
4. run-flat tire as claimed in claim 3; it is characterized in that described wheel rim protection part has along tire width direction and is positioned at the inboard and rubber part that is made of solid rubber and the outer rubber part that is positioned at the outside and is made of soft rubber along tire width direction.
5. run-flat tire as claimed in claim 4 is characterized in that, the solid rubber of rubber part has 100% modulus that is not less than 3.0MPa in constituting, and the soft rubber of formation outer rubber part has 100% modulus less than 3.0MPa.
6. as claim 4 or 5 described run-flat tires, it is characterized in that described interior rubber part is not less than 40% with respect to the percent by volume of whole wheel rim protection part.
7. as claim 4,5 or 6 described run-flat tires, it is characterized in that, rubber part forms by the rubber bead infantees is extended towards direction radially outward in described, and the outer rubber part forms by the exocuticle rubber that constitutes the sidewall part is extended towards inward direction radially.
8. as each described run-flat tire among the claim 4-7, it is characterized in that, described compound enhancement layer be set at interior and outer rubber part between.
9. as each described run-flat tire among the claim 2-8, it is characterized in that the enhancing element that constitutes compound enhancement layer is a non-woven fabric.
10. as each described run-flat tire among the claim 2-9, it is characterized in that the enhancing element that constitutes compound enhancement layer is the filament fiber that 0.01-1mm and fibre length are not less than 1mm for its fibre diameter.
11., it is characterized in that being arranged to make it to surround on the external peripheral surface of wheel rim protection part compound enhancement layer as each described run-flat tire among the claim 2-10.
12. as each described run-flat tire among the claim 1-11, it is characterized in that, wherein a pair of narrow enhancing bracing ply that extends abreast of the circumferencial direction of cord and tire is set at the position that each all covers the end of this bracing ply, and the distance of measuring along the inner end positions of Width from the tread width end position to narrow enhancing bracing ply of tire is not less than 1/4 of tread width.
13. run-flat tire as claimed in claim 12, it is characterized in that, a plurality of vertical main grooves that extend along tire circumferential direction are set on tread portion, and preferably are arranged to make it to be positioned at the inboard with respect to width centreline narrow enhancing bracing ply along the vertical main groove of outermost of tire width direction along the inner of tire width direction.
14. as each described run-flat tire among the claim 1-13, it is characterized in that, with described mounting of tyre on the adjustment wheel rim and be filled with given air pressure, and in the cross-sectional plane that tire/wheel assembly is cut open along tire width direction under idle condition
Described wheel rim is protected in the specific region that partly is set in place on outer surface of tire, and this zone extends to the extreme higher position of the outside face that contacts with the outside face of wheel rim from tire maximum width position on the outer surface,
Draw a circular arc determining the outside face of tire maximum width position and wheel rim, and suppose the reference circular arc of this circular arc for the profile of the outside face of approximate described specific region (except wheel rim protection part),
In described specific region, with many straight normals of auxiliary circle sag on the ratio of minimum value and maxim of the tire thickness measured preferably in 0.8 to 1.0 scope, and
As the distance between the end face of wheel rim protection part measured on reference circular arc and the normal that draws from the reference circular arc, the maximum height of wheel rim protection part is preferably the tire thickness of measuring on the normal identical with maximum height 0.52-1.40 doubly.
15. run-flat tire as claimed in claim 14 is characterized in that, the maximum height of described wheel rim protection part for the 0.58-1.20 of the tire thickness on identical normal, measured doubly.
16. as claim 14 or 15 described run-flat tires; it is characterized in that the center-line-average by the wheel rim protection part that will obtain divided by the length of bottom on the reference circular arc of wheel rim protection part along the cross-sectional area of the protection of the wheel rim in the cross-sectional plane of tire width direction intercepting part be not less than 0.6 times of maximum height of wheel rim protection part and less than 1.0 times of this maximum height.
17., it is characterized in that described wheel rim protection part has the trapezoidal cross-sectional shape of being essentially as claim 14,15 or 16 described run-flat tires.
18. run-flat tire as claimed in claim 17 is characterized in that, the end face of described wheel rim protection part forms a plane.
19. run-flat tire as claimed in claim 18 is characterized in that, the length of end face in the cross-sectional plane that intercepts along tire width direction of described wheel rim protection part is 0.14 to 0.90 times of above-mentioned bottom lengths.
20., it is characterized in that described wheel rim is protected part to have and is substantially leg-of-mutton cross sectional shape as claim 14,15 or 16 described run-flat tires.
21. as each described run-flat tire among the claim 1-20, it is characterized in that, form a level and smooth curve at the outside face of tire and the boundary member between the wheel rim protection external peripheral surface partly.
22., it is characterized in that described Reinforced Rubber has 100% modulus that is not less than 4MPa as each described run-flat tire among the claim 1-21.
23. as each described run-flat tire among the claim 1-22, it is characterized in that the one deck at least in the multilayer carcass plies of formation carcass comprises the organic fiber cord that is selected from the group of being made up of 6-nylon, 66-nylon, polyethylene terephthalate, rayon, PEN and aromatic poly amide.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP070250/2003 | 2003-03-14 | ||
| JP2003070250 | 2003-03-14 | ||
| JP387632/2003 | 2003-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1774349A true CN1774349A (en) | 2006-05-17 |
Family
ID=36760886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200480010002 Pending CN1774349A (en) | 2003-03-14 | 2004-03-12 | Pneumatic tire and method of mounting the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1774349A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101181860B (en) * | 2006-10-10 | 2010-10-27 | 固特异轮胎和橡胶公司 | Runflat tire |
| CN101301845B (en) * | 2007-05-07 | 2011-06-08 | 东洋橡胶工业株式会社 | Tyre capable of being used when air leaks |
| CN101903197B (en) * | 2007-12-21 | 2012-08-29 | 米其林技术公司 | Run-flat tyre having an additional sidewall reinforcement |
| CN103029534A (en) * | 2011-09-28 | 2013-04-10 | 横滨橡胶株式会社 | Pneumatic run flat tire |
| CN104859380A (en) * | 2015-05-07 | 2015-08-26 | 张文贤 | Tire prevented from edge separation |
| CN105829127A (en) * | 2013-12-25 | 2016-08-03 | 株式会社普利司通 | Side-Reinforced Run-Flat Tire |
| CN107984979A (en) * | 2016-10-26 | 2018-05-04 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN112313092A (en) * | 2018-07-02 | 2021-02-02 | 横滨橡胶株式会社 | Pneumatic tire |
| CN112996674A (en) * | 2018-10-30 | 2021-06-18 | 米其林企业总公司 | Tire with a recess in the bead region |
| CN113263871A (en) * | 2021-06-18 | 2021-08-17 | 吉利汽车研究院（宁波）有限公司 | Tire, preparation method thereof and automobile |
| CN114516245A (en) * | 2020-11-20 | 2022-05-20 | 通伊欧轮胎株式会社 | Tyre for vehicle wheels |
-
2004
- 2004-03-12 CN CN 200480010002 patent/CN1774349A/en active Pending
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101181860B (en) * | 2006-10-10 | 2010-10-27 | 固特异轮胎和橡胶公司 | Runflat tire |
| CN101301845B (en) * | 2007-05-07 | 2011-06-08 | 东洋橡胶工业株式会社 | Tyre capable of being used when air leaks |
| CN101903197B (en) * | 2007-12-21 | 2012-08-29 | 米其林技术公司 | Run-flat tyre having an additional sidewall reinforcement |
| CN103029534A (en) * | 2011-09-28 | 2013-04-10 | 横滨橡胶株式会社 | Pneumatic run flat tire |
| CN103029534B (en) * | 2011-09-28 | 2016-08-17 | 横滨橡胶株式会社 | Pneumatic run flat tire |
| US10099517B2 (en) | 2013-12-25 | 2018-10-16 | Bridgestone Corporation | Side-reinforced run-flat tire |
| CN105829127A (en) * | 2013-12-25 | 2016-08-03 | 株式会社普利司通 | Side-Reinforced Run-Flat Tire |
| CN105829127B (en) * | 2013-12-25 | 2017-12-08 | 株式会社普利司通 | Side enhanced run-flat tire |
| CN104859380A (en) * | 2015-05-07 | 2015-08-26 | 张文贤 | Tire prevented from edge separation |
| CN107984979A (en) * | 2016-10-26 | 2018-05-04 | 住友橡胶工业株式会社 | Pneumatic tire |
| CN112313092A (en) * | 2018-07-02 | 2021-02-02 | 横滨橡胶株式会社 | Pneumatic tire |
| CN112996674A (en) * | 2018-10-30 | 2021-06-18 | 米其林企业总公司 | Tire with a recess in the bead region |
| CN112996674B (en) * | 2018-10-30 | 2022-11-25 | 米其林企业总公司 | Tyre with recesses in the bead region |
| CN114516245A (en) * | 2020-11-20 | 2022-05-20 | 通伊欧轮胎株式会社 | Tyre for vehicle wheels |
| CN114516245B (en) * | 2020-11-20 | 2024-01-02 | 通伊欧轮胎株式会社 | Tire with a tire body |
| CN113263871A (en) * | 2021-06-18 | 2021-08-17 | 吉利汽车研究院（宁波）有限公司 | Tire, preparation method thereof and automobile |
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